CN201699073U - Anti-explosion nut cap of micro-resistance cylindrical lithium ion battery - Google Patents
Anti-explosion nut cap of micro-resistance cylindrical lithium ion battery Download PDFInfo
- Publication number
- CN201699073U CN201699073U CN2010201808906U CN201020180890U CN201699073U CN 201699073 U CN201699073 U CN 201699073U CN 2010201808906 U CN2010201808906 U CN 2010201808906U CN 201020180890 U CN201020180890 U CN 201020180890U CN 201699073 U CN201699073 U CN 201699073U
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- China
- Prior art keywords
- pressure disc
- rupture pressure
- explosion
- rupture membrane
- orifice plate
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- Expired - Fee Related
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Gas Exhaust Devices For Batteries (AREA)
Abstract
The utility model relates to an anti-explostion nut cap of a micro-resistance cylindrical lithium ion battery, which comprises an upper nut cap, a spacer, a rupture membrane with a wall, a pore plate and a seal ring, wherein the upper nut cap is provided with a plurality of pores; the wall of the rupture membrane is bent to make the spacer and the upper nut cap wrapped in the cavity of the rupture membrane; the wrapped rupture membrane is embedded in the seal ring coated with gum; the pore plate is embedded on the bottom surface of the seal ring; the pore plate and the rupture membrane are in laser spot welding; the bottom surface of the rupture membrane is provided with a downwards convex circular welding platform; a prestressing decompression ring is formed between the circular welding platform and the bottom surface of the rupture membrane; the prestressing decompression ring is cut by matching with the sharp spinous flanging of the inner edge of the spacer, and the flanging of the brim of the upper nut cap and the convex welding spots on the brim are tightly welded with the bent wall of the rupture membrane, and thereby, the turn-over explosion of the rupture membrane and the reduction of the overall internal resistance of the nut cap are realized. The nut cap has simple, compact and stable structure, low internal resistance and high battery performance and is not easy to deform or stagger. The rupture membrane can normally explode after being turned over and has stable anti-explosion performance and long service life.
Description
Technical field
The utility model relates to a kind of cylindrical lithium ion cell cap, is a kind of little resistance, without explosion cylindrical lithium ion battery explosion-proof cap specifically.
Background technology
Lithium ion battery cover is the critical component of lithium ion battery, and it is directly connected to battery reliability, useful life, amount of capacity, producers and consumers and produces safe in utilization.Existing column lithium ion battery block is made up of loam cake, pad, explosion-proof diaphragm, orifice plate, sealing ring, after the improvement of battery plus-negative plate material technology, the technology that tradition uses the heating of PTC pad control battery to expand is superseded substantially, mainly be because the internal resistance of PTC pad (high-temperature thermistor) own is bigger, have a strong impact on battery capacity and the number of times that discharges and recharges capable of circulation.In order to improve the fail safe of battery cap, continue to use the frame mode of PTC pad, the PTC pad is replaced with ring-type aluminium backing or copper nickel plating ring pad etc., rupture pressure disc is with the body of wall burst disk instead, and by being with the body of wall burst disk pad, loam cake to be bundled together the sealing ring of putting into inner gluing, from the negative orifice plate and burst disk are passed through laser welding, compare traditional lithium electricity block, the block internal resistance is reduced to below the 1m Ω from 10m Ω.
As the patent No. is the disclosed novel explosion-proof cover cap for high-time discharging column lithium ion battery of CN200920113873.8, adopt to be provided with in the hollow sealing body and have the ring-type indentation and the lug boss lower edge is the explosion-proof valve of platform structure, the explosion-proof valve periphery is provided with the bound edge of projection, and this bound edge adopts mould that top cover is encased fully.When the inside battery gas pressure increases to setup pressure value, explosion-proof valve is by the upwards upset of ring-type indentation place, the arc convex portion that extend downwards at the explosion-proof valve middle part upwards overturns orifice plate and explosion-proof valve middle deck to be come off form and opens circuit, the interior pressure in back of opening circuit continues to increase, when increasing to safety value, explosion-proof valve pops and can avoid explosion accident, its weak point is: after arc convex portion upwards overturns, because softening through high annealing, material under gas pressure, is forced to expand to prolong cover the top cover pore easily, the pressure release of ring-type indentation place was lost efficacy can't open pressure release, causes battery explosion; Do not adopt pad between explosion-proof valve and top cover, the block internal resistance can be reduced to 0.5m Ω, but explosion-proof valve upwards the upset back since high annealing more large tracts of land cover the top cover pore, not having gasket construction block bulk strength this moment reduces, the under high pressure easy bulk deformation of top cover breaks away from the hollow sealing body and causes battery explosion, and security performance is low.
In addition, when cell package block and box hat, adopt mould radially pressing box hat and block, block produces and is subjected to radial pressure, radial pressure reaches the cap sealed circle, the sealing ring distortion is with irregular orifice plate and the rupture pressure disc of being passed to of radial pressure, and the easy dislocation of orifice plate or rupture pressure disc disconnects both positive and negative polarity in advance or rupture pressure disc abnormal deformation generation explosion unlatching causes battery to be scrapped; And the rupture pressure disc abnormal deformation makes indentation place closure, and the opening pressure infinity can't normally be opened the battery explosive when causing inner pressure of battery to increase.
Summary of the invention
Can't normally open pressure release in order to solve in the prior art lithium ion battery cover rupture pressure disc upset back indentation, block internal resistance reduction and capping structure are stable can't be taken into account, battery life is short, and yielding the breaking of rupture pressure disc of block during the encapsulation of block and housing, rupture pressure disc and orifice plate easily misplace to rupture and cause battery to be scrapped, the rupture pressure disc deformable folding causes drawbacks such as battery explosion, the purpose of this utility model provides the pressure release that can normally pop after a kind of rupture pressure disc overturns, block internal resistance reduction and capping structure are stable to be taken into account, the battery long service life, rupture pressure disc and orifice plate did not have distortion when block encapsulated with housing, dislocation-free, the battery anti-explosion stable performance, produce explosion-proof cap of micro-resistance cylindrical lithium ion battery safe in utilization.
The technical solution adopted in the utility model is: a kind of explosion-proof cap of micro-resistance cylindrical lithium ion battery, comprise upper cap, pad, the rupture pressure disc of band body of wall, orifice plate and sealing ring, upper cap is provided with a plurality of pores, the body of wall bending of rupture pressure disc is wrapped in pad and upper cap in the rupture pressure disc cavity, rupture pressure disc behind the above-mentioned parcel embeds and scribbles in the sealing ring of glue, the bottom surface of sealing ring is packed with orifice plate, orifice plate and rupture pressure disc laser spot welding, its technical characterictic is that the bottom surface of described rupture pressure disc is provided with the circular weld platform to lower convexity, forms between circular weld platform and the rupture pressure disc bottom surface and answers the pressure release ring in advance.When cell internal pressure increases, rupture pressure disc circular weld platform is overturn to the upper cap direction by cell internal pressure, when the circular weld platform is stressed when reaching rupture pressure disc and orifice plate pad separating pressure, the fracture of the pad of rupture pressure disc and orifice plate, the circular weld platform of rupture pressure disc is upset upwards; Cell internal pressure moment reduces the back and continues to increase, the stressed lasting increase of circular weld platform, when the circular weld platform is stressed when reaching rupture pressure disc bottom surface circular weld platform and answering the pressure release ring to pop pressure in advance, answer the pressure release ring to pop in advance circular weld platform and rupture pressure disc bottom surface are thrown off, cell internal pressure is by the pressure release of upper cap pore, no battery explosion hidden danger, safe in utilization.
Described upper cap shade upper surface evenly is provided with the solder joint of projection more than two, the solder joint of projection and the bending body of wall ultrasonic bonding of rupture pressure disc more than two.Upper cap and rupture pressure disc after the welding are connected as a single entity, and both connect closely, have eliminated gap internal resistance each other, have reduced the whole internal resistance of block.
Described upper cap shade is provided with flange upwards.When welding rupture pressure disc and upper cap, there are interaction force in the flange of upper cap and rupture pressure disc bending body of wall bending part, and it is neat to help improving rupture pressure disc body of wall bending part profile, is convenient to the installation of rupture pressure disc and sealing ring.
Be equipped with in the described pad with rupture pressure disc and answer the corresponding sharp thorn-like flange of pressure release ring position in advance.When the circular weld platform is stressed when reaching rupture pressure disc bottom surface circular weld platform and answering the pressure release ring to pop pressure in advance, sharp thorn-like flange plays the cutting knife effect to answering the pressure release ring in advance, guarantee that circular weld platform and rupture pressure disc bottom surface throw off, advance an anti-explosion safety performance that has ensured battery.
Described sealing ring comprises orifice plate circle and both positive and negative polarity insulated ring, and the orifice plate circle forms hollow out formula sealing ring in the plastics intercell connector more than two is connected positive and negative class F insulation circle.The orifice plate circle is connected through the plastics intercell connector with positive and negative class F insulation circle, and during positive and negative class F insulation circle stress deformation, rock deformation pressure does not have influence to the orifice plate circle, and the orifice plate circle is indeformable, guarantees that the welding of orifice plate and circular weld platform is firm, does not have distortion, dislocation-free.
Adopt above technical scheme, the beneficial effects of the utility model are:
1, when inside battery pressure-bearing, temperature rising, the extensible deflection of circular weld platform of rupture pressure disc bottom surface is little, pop in the process at the stressed rupture pressure disc that is turned to of rupture pressure disc, answer the pressure release ring stressed all the time in advance between rupture pressure disc and the circular weld platform, answer in advance when the pressure release ring is stressed to reach fracture pressure and rupture, the circular weld platform pops from rupture pressure disc and makes the inside battery pressure release, the circular weld platform of trace extensional is difficult for stopping up the upper cap pore when the upper cap direction is extended, battery does not have hidden peril of explosion, the security performance height; Be equipped with in the pad with rupture pressure disc and answer the corresponding sharp thorn-like flange of pressure release ring position in advance, continue in the loading process in circular weld platform upset back, the circular weld platform is stressed to be reached rupture pressure disc bottom surface circular weld platform and answers the pressure release ring pressure that pops in advance, this moment, sharp thorn-like flange played the cutting knife effect to answering the pressure release ring in advance, guaranteed that further the circular weld platform pops from rupture pressure disc, has improved battery safety;
2, the upper cap shade is provided with flange upwards, flange that the upper cap shade makes progress and rupture pressure disc body of wall bending part have interaction force, body of wall bending part transformation rule, attractive in appearance has been avoided the body of wall bending not have opposition and has been caused bending part fold and irregular deformation that the sealing property of sealing ring and body of wall is reduced; Upper cap shade upper surface evenly is provided with the solder joint of projection more than two, the solder joint of projection and the bending body of wall ultrasonic bonding of rupture pressure disc more than two, rupture pressure disc body of wall parcel contact firmness and overall structure crushing resistance have been improved, cooperate flange that the upper cap shade makes progress also with the bending body of wall ultrasonic bonding of rupture pressure disc, electric current is divided into two-way in the block, one road flow through upper cap, bending body of wall and rupture pressure disc, another road flow through upper cap, pad, rupture pressure disc, two-way resistance parallel connection reduction block overall electrical resistance; Upper cap and bending body of wall adopt welding connecting mode, have eliminated gap internal resistance each other, have further reduced the block internal resistance, the whole internal resistance of blocking a shot is reduced to below the 0.08m Ω, the finished product battery capacity improves greatly, and the number of times that discharges and recharges capable of circulation increases, and battery performance improves;
3, the orifice plate circle of sealing ring forms hollow out formula sealing ring in the plastics intercell connector is connected positive and negative class F insulation circle, orifice plate is embedded in the orifice plate circle and circular weld platform laser welding, during positive and negative class F insulation circle stress deformation, rock deformation pressure does not have influence to the orifice plate circle, the orifice plate circle is indeformable, when block encapsulates with battery steel shell, employing mould radially pressing box hat is given block generation radial pressure with block, radial pressure can't reach the orifice plate circle by positive and negative class F insulation circle, orifice plate or rupture pressure disc do not have distortion, dislocation-free, stopped the distortion of orifice plate or rupture pressure disc, dislocation causes the battery anti-explosion film to pop or rupture pressure disc is undesired pops, and battery safety is higher.
The utility model block rupture pressure disc bottom surface is adopted and is answered the pressure release ring to connect the circular weld platform in advance, circular weld platform and orifice plate welding, answer that protruding solder joint and rupture pressure disc bending body of wall closely weld on pressure release ring, upper cap shade flange and the shade in the tie spacer in advance along sharp-pointed thorn-like flange cutting, realize that rupture pressure disc is by setting pressure upset pop and the block a shot reduction of whole internal resistance, it is simple in structure, compact, stable, not yielding, dislocation, the block internal resistance is low, the battery performance height, pressure release can normally pop after the rupture pressure disc upset, explosion-proof performance is stable, and is safe in utilization, the life-span is long.
Description of drawings
Fig. 1 is the utility model structural representation;
Fig. 2 is the structural representation of the utility model sealing ring.
Among the figure: upper cap 1, solder joint 11, flange 12, pad 2, sharp thorn-like flange 21, rupture pressure disc 3, bending body of wall 31 is answered pressure release 32 in advance, circular weld platform 33, orifice plate 4, sealing ring 5, orifice plate circle 51, both positive and negative polarity insulated ring 52, plastics intercell connector 53.
Embodiment
The utility model is described in further detail below in conjunction with drawings and Examples.
Shown in Fig. 1,2, explosion-proof cap of micro-resistance cylindrical lithium ion battery mainly comprises upper cap 1, pad 2, rupture pressure disc 3, orifice plate 4 and sealing ring 5.Sealing ring 5 comprises orifice plate circle 51 and both positive and negative polarity insulated ring 52, and orifice plate circle 51 forms hollow out formula sealing ring in the plastics intercell connector 53 more than two is connected positive and negative class F insulation circle 52; Sealing ring 5 outer belows are provided with the orifice plate 4 that is positioned on the orifice plate circle 52, be provided with rupture pressure disc 3 in the sealing ring 5 from the bottom to top successively, pad 2 and upper cap 1, the bottom surface of rupture pressure disc 3 is provided with the circular weld platform 33 to lower convexity, form between circular weld platform 33 and rupture pressure disc 3 bottom surfaces and answer pressure release ring 32 in advance, circular weld platform 33 and orifice plate 4 laser welding, the bending body of wall 31 of rupture pressure disc 3 is pressed together on upper cap 1 and pad 2 on the rupture pressure disc 3, solder joint 11 ultrasonic bonding of projection more than two that bending body of wall 31 and upper cap 1 shade upper surface evenly are provided with, upper cap 1 shade is provided with the flange 12 corresponding with bending body of wall 31 bending parts upwards; Be equipped with in the pad 2 with rupture pressure disc 3 and answer the corresponding sharp thorn-like flange 21 in pressure release ring 32 positions in advance.
During the utility model assembling, at first pad 2 is put into rupture pressure disc 3 make pad sharp thorn-like flange 21 corresponding rupture pressure discs 3 answer pressure release ring 32 in advance, then upper cap 1 is placed on the pad 2 in the rupture pressure disc 3, the body of wall of bending rupture pressure disc 3 again, make solder joint 11 ultrasonic bonding of bending body of wall 31 and upper cap 1, to weld the good rupture pressure disc that has upper cap 13 at last and put into the both positive and negative polarity insulated ring 52 of sealing ring 5, make the orifice plate circle 51 of rupture pressure disc circular weld platform 33 corresponding sealing rings, will have the sealing ring and the battery steel shell assembling of rupture pressure disc at last.
During use, inside battery pressure-bearing, temperature raise, answer the pressure release ring stressed all the time in advance between rupture pressure disc and the circular weld platform, answer in advance when the pressure release ring is stressed to reach fracture pressure and rupture, the circular weld platform pops from rupture pressure disc and makes the inside battery pressure release, and this moment, the circular weld platform was difficult for stopping up the upper cap pore to the extensional of upper cap direction trace, and the sharp thorn-like flange of ring plays the cutting knife effect to answering the pressure release ring in advance in the pad, the battery anti-explosion performance is good, and is safe in utilization.
Claims (5)
1. explosion-proof cap of micro-resistance cylindrical lithium ion battery, comprise upper cap (1), pad (2), the rupture pressure disc (3) of band body of wall, orifice plate (4) and sealing ring (5), upper cap is provided with a plurality of pores, the body of wall bending of rupture pressure disc is wrapped in pad and upper cap in the rupture pressure disc cavity, rupture pressure disc behind the above-mentioned parcel embeds and scribbles in the sealing ring of glue, the bottom surface of sealing ring is packed with orifice plate, orifice plate and rupture pressure disc laser spot welding, it is characterized in that: the bottom surface of described rupture pressure disc (3) is provided with the circular weld platform (33) to lower convexity, forms between circular weld platform and the rupture pressure disc bottom surface and answers pressure release ring (32) in advance.
2. explosion-proof cap of micro-resistance cylindrical lithium ion battery according to claim 1, it is characterized in that: described upper cap (1) shade upper surface evenly is provided with the solder joint (11) of projection more than two, the solder joint of projection and bending body of wall (31) ultrasonic bonding of rupture pressure disc more than two.
3. explosion-proof cap of micro-resistance cylindrical lithium ion battery according to claim 1 and 2 is characterized in that: described upper cap (1) shade is provided with flange (12) upwards.
4. explosion-proof cap of micro-resistance cylindrical lithium ion battery according to claim 1 is characterized in that: be equipped with in the described pad (2) with rupture pressure disc and answer the corresponding sharp thorn-like flange (21) in pressure release ring (32) position in advance.
5. explosion-proof cap of micro-resistance cylindrical lithium ion battery according to claim 1, it is characterized in that: described sealing ring (5) comprises orifice plate circle (51) and both positive and negative polarity insulated ring (52), and the orifice plate circle is connected through the plastics intercell connector (53) more than two and forms hollow out formula sealing ring in the positive and negative class F insulation circle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201808906U CN201699073U (en) | 2010-05-06 | 2010-05-06 | Anti-explosion nut cap of micro-resistance cylindrical lithium ion battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201808906U CN201699073U (en) | 2010-05-06 | 2010-05-06 | Anti-explosion nut cap of micro-resistance cylindrical lithium ion battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201699073U true CN201699073U (en) | 2011-01-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010201808906U Expired - Fee Related CN201699073U (en) | 2010-05-06 | 2010-05-06 | Anti-explosion nut cap of micro-resistance cylindrical lithium ion battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201699073U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101814589A (en) * | 2010-05-06 | 2010-08-25 | 熊辉 | Explosion-proof cap of micro-resistance cylindrical lithium ion battery |
-
2010
- 2010-05-06 CN CN2010201808906U patent/CN201699073U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101814589A (en) * | 2010-05-06 | 2010-08-25 | 熊辉 | Explosion-proof cap of micro-resistance cylindrical lithium ion battery |
| CN101814589B (en) * | 2010-05-06 | 2012-01-04 | 熊辉 | Explosion-proof cap of micro-resistance cylindrical lithium ion battery |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110105 Termination date: 20130506 |